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Method for preparing starch ionomer and fully-degradable plastic modified by starch ionomer

An ionomer, fully degradable technology, applied in the production of bulk chemicals, etc., can solve the problems of narrow processing window, decreased mechanical properties of polyester blends, low processing viscosity, etc.

Active Publication Date: 2021-04-27
中化石化销售有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the addition of traditional thermoplastic starch leads to a decrease in the mechanical properties of polyester blends, making it difficult to add more than 50wt% of traditional modified thermoplastic starch elastomers in synthetic degradable polymer materials
In addition, thermoplastic starch elastomers still have problems such as narrow processing window, low processing viscosity, and poor thermal stability.

Method used

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  • Method for preparing starch ionomer and fully-degradable plastic modified by starch ionomer
  • Method for preparing starch ionomer and fully-degradable plastic modified by starch ionomer
  • Method for preparing starch ionomer and fully-degradable plastic modified by starch ionomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1) Mix high-amylose starch and water at a ratio of 1:0.1, and gelatinize at 80°C for 80 minutes. Add the gelatinized high-amylose starch, monosodium citrate, and dimethylol propionic acid into a supercritical carbon dioxide reactor at a ratio of 1:0.3:0.8, and use a fluidized bed in a supercritical carbon dioxide fluid at 40°C and 12MPa. The reaction is carried out in the form of carbon dioxide, and the reaction product leaves the reactor with the carbon dioxide fluid, and the starch ionomer is obtained after separation under reduced pressure.

[0063] 2) The synthesized starch ionomer was mixed with PLA at a ratio of 1:0.25, and granulated by twin-screw melt extrusion at an extrusion temperature of 180°C to obtain a fully degradable plastic.

Embodiment 2

[0065] 1) Mix high-amylose starch and water at a ratio of 1:0.2, and gelatinize at 90°C for 40 minutes. Add the gelatinized high-amylose starch, monosodium fumarate, and dimethylol propionic acid in a ratio of 1:0.5:0.4 to a supercritical carbon dioxide reactor, and use a fluidized bed in a supercritical carbon dioxide fluid at 40°C and 10MPa. The reaction is carried out in the form of carbon dioxide, and the reaction product leaves the reactor with the carbon dioxide fluid, and the starch ionomer is obtained after separation under reduced pressure.

[0066] 2) The synthesized starch ionomer and PBAT were mixed at a ratio of 1:0.5, and granulated by twin-screw melt extrusion at an extrusion temperature of 110°C to obtain a fully degradable plastic.

Embodiment 3

[0068] 1) Mix high-amylose starch and water at a ratio of 1:0.5, and gelatinize at 100°C for 30 minutes. Add the gelatinized high-amylose starch, monosodium malate, and dimethylolbutyric acid into a supercritical carbon dioxide reactor at a ratio of 1:0.8:0.3, and use a fluidized bed in a supercritical carbon dioxide fluid at 40°C and 8MPa. The reaction is carried out in the form of carbon dioxide, and the reaction product leaves the reactor with the carbon dioxide fluid, and the starch ionomer is obtained after separation under reduced pressure.

[0069] 2) The synthesized starch ionomer was mixed with PBS at a ratio of 1:3, and granulated by twin-screw melt extrusion at an extrusion temperature of 150°C to obtain a fully degradable plastic.

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Abstract

The invention provides a method for preparing a starch ionomer and fully-degradable plastic modified by the starch ionomer. The invention belongs to the field of high polymer materials. The method comprises the following steps of: mixing high amylose with water, and carrying out gelatinization treatment to obtain a gelatinized product; and reacting the gelatinized product with an organic acidic salt and a dihydroxy carboxylic acid to obtain the starch ionomer. The starch ionomer can be used for preparing fully-degradable plastic, and the cost of the prepared fully-degradable plastic can be effectively reduced while the mechanical properties are ensured.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing starch ionomer and its modified fully degradable plastic. Background technique [0002] With the rapid increase in the number of non-degradable polymers in recent years, environmental problems have become more and more serious. Among them, non-degradable polymer films are particularly polluted because they are difficult to recycle. Therefore, it is imperative to study degradable polymer film materials to replace non-degradable polymer films. Among many degradable polymers, starch, as a natural polymer, is considered to be one of the most promising raw materials for degradable polymer films due to its abundant sources, short regeneration cycle, low cost, and good degradability. However, the intermolecular and intramolecular hydrogen bonds of starch macromolecules bring difficulties to starch processing. The usual solution is to add plasticizers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B33/02C08L3/16C08L67/04C08L67/02B29B9/06B29B9/12
CPCC08B33/02C08L3/16C08L67/02B29B9/06B29B9/12C08L2201/06C08L2203/16C08L67/04Y02P20/54
Inventor 李波梁胜轲王武聪金华杜中杰孙佩鑫侯斌
Owner 中化石化销售有限公司
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